<template>
    <view class="cart-container" v-if="cart.length !== 0">
        <!-- 购物车商品列表的标题区域 -->
        <view class="cart-title">
            <!-- 左侧的图标 -->
            <uni-icons type="shop" size="18"></uni-icons>
            <!-- 描述文本 -->
            <text class="cart-title-text">购物车</text>
        </view>
        <!-- 循环渲染购物车中的商品信息 -->
        <uni-swipe-action>
            <block v-for="(goods, i) in cart" :key="i">
                <uni-swipe-action-item :options="options" @click.native="swipeItemClickHandler(goods)">
                    <my-goods :goods="goods" :show-radio="true" :show-num="true" @radio-change="radioChangeHandler" @num-change="numberChangeHandler"></my-goods>
                </uni-swipe-action-item>
            </block>
        </uni-swipe-action>
        <!-- 结算区域 -->
        <my-settle></my-settle>
    </view>
    <!-- 空白购物车区域 -->
    <view class="empty-cart" v-else>
        <image src="/static/cart_empty@2x.png" class="empty-img"></image>
        <text class="tip-text">空空如也~</text>
    </view>
</template>

<script>
// 导入自己封装的 mixin 模块
import badgeMix from '@/mixins/tabbar-badge.js';
import { mapState, mapMutations } from 'vuex';
export default {
    data() {
        return {
            options: [
                {
                    text: '删除', // 显示的文本内容
                    style: {
                        backgroundColor: '#C00000' // 按钮的背景颜色
                    }
                }
            ]
        };
    },
    // 将 badgeMix 混入到当前的页面中进行使用
    mixins: [badgeMix],
    computed: {
        // 将 m_cart 模块中的 cart 数组映射到当前页面中使用
        ...mapState('m_cart', ['cart'])
    },
    methods: {
        ...mapMutations('m_cart', ['updateGoodsState', 'updateGoodsCount', 'removeGoodsById']),
        // 商品的勾选状态发生了变化
        radioChangeHandler(e) {
            this.updateGoodsState(e); // 输出得到的数据 -> {goods_id: 395, goods_state: false}
        },
        numberChangeHandler(e) {
            this.updateGoodsCount(e);
        },
        // 点击了滑动操作按钮
        swipeItemClickHandler(goods) {
            this.removeGoodsById(goods.goods_id);
            // console.log(123)
        }
    }
};
</script>

<style lang="scss" scoped>
.empty-cart {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 150px;

  .empty-img {
    width: 90px;
    height: 90px;
  }

  .tip-text {
    font-size: 12px;
    color: gray;
    margin-top: 15px;
  }
}
.cart-container {
    padding-bottom: 50px;
}
.cart-title {
    height: 40px;
    display: flex;
    align-items: center;
    font-size: 14px;
    padding-left: 5px;
    border-bottom: 1px solid #efefef;
    .cart-title-text {
        margin-left: 10px;
    }
}
</style>
